Malicious PDF — malware analysis report

Static analysis result for SHA-256 f789896b71c05036…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 02:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 113755357dcc73af3a698c44116ce1c0 SHA-1: 5c9a61d3955645ec7ccc09dcd2e5aced91fd4a39 SHA-256: f789896b71c05036cb960ccf0acdeb43eea675b7ca4d4c62e04034ebcd12fd26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of embedded JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139866829038---63994309713.pdf In PDF document text
    • http://schokozentrale.de/idata/64036924538.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/roleviwagenolava.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/kivizisakijigusa.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/kipivodezulukulikaziko.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/63812499288.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f108f639e0---sokifumatavig.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/14118561851.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/lavusutofexeb.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/katixowojax.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/vukegivoletawizinudoj.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210902014821.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50499045005.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/68301808145.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/mawiwebexezokizimin.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6969428bf763e072a3a468027c11eb40/76160313849.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/72835162645.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/48475097711.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/ranarusetuga.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/fikivawozas.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/dotubutak.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/28959988984.pdfIn PDF document text
    • http://charontrade.hu/data/file/10902686195.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/dumabituganageki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rocks+film+streamingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 10816 bytes
SHA-256: 0ac1bc9876575541eadaf6dfb896e5de3a9fbe75c639b206854fa8e4a0492060
font_02_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 18280 bytes
SHA-256: 946d4af0cfc1523d7292470dbeba2ad47547617d139255cc6e50c534c4d1fb42

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